10643721 has 8 divisors (see below), whose sum is σ = 15481824. Its totient is φ = 6450720.

The previous prime is 10643719. The next prime is 10643771. The reversal of 10643721 is 12734601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10643721 - 2¹ = 10643719 is a prime.

It is a super-2 number, since 2×10643721² = 226577593451682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10643691 and 10643700.

It is not an unprimeable number, because it can be changed into a prime (10643701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161236 + ... + 161301.

It is an arithmetic number, because the mean of its divisors is an integer number (1935228).

Almost surely, 2^10643721 is an apocalyptic number.

10643721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10643721 is a deficient number, since it is larger than the sum of its proper divisors (4838103).

10643721 is a wasteful number, since it uses less digits than its factorization.

10643721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322551.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 10643721 is about 3262.4716090719. The cubic root of 10643721 is about 219.9705263546.

The spelling of 10643721 in words is "ten million, six hundred forty-three thousand, seven hundred twenty-one".